HIGH VOLTAGES MAY BE PRESENT AT THE GENERATOR’S TERMINALS WHEN THE UNIT IS RUNNING. SOME
ACCESSORY EQUIPMENT SUCH AS SPACE HEATERS MAY BE ENERGIZED FROM AN OUTSIDE POWER SOURCE
WHEN THE UNIT IS AT REST. TOOLS, EQUIPMENT, CLOTHING AND YOUR BODY MUST BE KEPT CLEAR OF
ROTATING PARTS AND ELECTRICAL CONNECTIONS. SPECIAL PRECAUTIONS MUST BE TAKEN DURING
TROUBLESHOOTING SINCE PROTECTIVE COVERS AND SAFETY DEVICES MAY BE REMOVED OR DISABLED TO
GAIN ACCESS AND PERFORM TESTS. BE CAREFUL. SERIOUS PERSONAL INJURY OR DEATH CAN RESULT FROM
THESE HAZARDS. CONSULT QUALIFIED PERSONNEL WITH ANY QUESTIONS.
GENERATOR PRODUCES NO VOLTAGE
CAUSE CHECK AND REMEDY
Voltmeter off or defective Check voltage with a separate meter at the generator terminals.
Incorrect or defective connections Verify generator connections. See drawings supplied with the generator or lead
connection diagrams in this manual. Inspect all wiring for loose connections, open
circuits, grounds, and short circuits.
Loss of residual Flash the field. Refer to field flashing in the service section. If the generator is equipped
with a PMG, field flashing is not necessary -- check regulator fuse and input power
from the PMG.
Defective diodes, suppressor, or windings Test the generator using the 12 volt battery test as specified in the testing section. If
the results indicate generator problems, perform insulation, continuity, and diode tests
as specified in the testing section.
Regulator protection operating Adjust regulator. Consult regulator manual.
Regulator inoperative Adjust or replace regulator. Consult regulator manual.
GENERATOR PRODUCES LOW VOLTAGE, NO LOAD
CAUSE CHECK AND REMEDY
Underspeed operation Check speed using a tachometer or frequency meter.
Voltmeter off or defective Check voltage with a separate meter at the generator terminals.
Incorrect or defective connections Verify generator connections. See drawings supplied with the generator or lead
connection diagrams in this manual. Inspect all wiring for grounds, open circuits and
short circuits.
Loss of regulator power Check regulator fuse and input power. Input power is produced by the generator’s
residual voltage or from an optional PMG.
Regulator adjustment Adjust regulator settings. Consult regulator manual.
Regulator incorrectly connected Review the generator connection diagram or reference the regulator manual.
Defective diodes, suppressor, or windings Test the generator using the 12 volt battery test as specified in the testing section. If
the results indicate generator problems, perform insulation, continuity, and diode tests
as specified in the testing section.
Regulator inoperative Adjust or replace regulator. Consult regulator manual.
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